NDLI: DC-bias cancellation for phase shift controlled dual active bridge

Content Provider	IEEE Xplore Digital Library
Author	Pena-Alzola, R. Mathe, L. Liserre, M. Blaabjerg, F. Kerekes, T.
Copyright Year	2013
Description	Author affiliation: Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark (Pena-Alzola, R.; Mathe, L.; Liserre, M.; Blaabjerg, F.; Kerekes, T.)
Abstract	The dual active bridge topology allows bidirectional power flow and galvanic isolation for DC/DC energy conversion. These features have made it the possible backbone of the future smart transformer for distribution. The different voltage drops and commutation dead-times of the semiconductor switches result in DC-voltage at the transformer terminals. Even small DC-voltage components produce large DC-bias currents as they are only limited by the transformer resistances. The DC-bias degrades the transformer performance by increasing the losses. If the core saturates the resulting current pulses can damage the converter. A typical approach to avoid the DC-bias is placing a capacitor in series with the transformer. This capacitor suffers large current variations, reducing its reliability, and complicates the control. The dual active bridge usually handles the power flow by modifying the phase-shift of the converter square waveforms. In this paper the duty-cycle of the converter waveforms is controlled to cancel the current DC-bias in both transformer sides. A formula relating the reference power and phase-shift is provided for the case of varying duty-cycle waveforms. The implementation with constant sampling frequency and its limitations are explained.
Sponsorship	IEEE Ind. Electron. Soc.
Starting Page	596
Ending Page	600
File Size	815075
Page Count	5
File Format	PDF
ISBN	9781479902248
ISSN	1553572X
DOI	10.1109/IECON.2013.6699202
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-10
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit faults Pulse width modulation Inductance Bridge circuits Phase modulation Switches Delays
Content Type	Text
Resource Type	Article

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